1 “...INTRODUCTION: Although observational studies are increasingly being used to address gaps...”

2 Subjects: “...Observational Studies as Topic...”

3 “...The highest-ranked tool was a design algorithm for studies of health care interventions developed...”

4 “...The highest-ranked tool was a design algorithm for studies of health care interventions developed...”

5 Subjects: “...Cohort Studies...”

6 Subjects: “...Cohort Studies...”

7 “... of evidence and possibly the strength of evidence; (4) "automated approaches" use databases of extracted study...”

8 “... of evidence and possibly the strength of evidence; (4) "automated approaches" use databases of extracted study...”

9 “... and Organization of Care Study Registry; bibliographies of published studies, and via contact with experts...”

10 “... and Organization of Care Study Registry; bibliographies of published studies, and via contact with experts...”

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